Abstract
Astyanax altiparanae (Osteichthyes, Tetragonopterinae) diet was evaluated before and after the Salto Caxias (Iguacu river) dam closure, in order to investigate this species trophic adaptability. Samples were taken from March 1997 to February 2000, and the contents of 583 stomachs were analyzed, separated and volumetrically quantified. During the river phase, the species showed a tendency to herbivory and, during the reservoir phase, to omnivory. Group analysis (DCA) showed two distinct temporal groups: specimens with more specialized diet, collected in phase river, and specimens collected after dam closure, with mixed diet. The results suggest that A. altiparanae has high trophic adaptability and may succeed in the new environment.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
